FAQs

Formwork

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  • Q. What is formwork?

    Forms or moulds or shutters are the receptacles in which concrete is placed, so that it will have the desired shape or outline when hardened. Once the concrete develops adequate strength, the forms are removed. Forms are generally made of the materials like timber, plywood, steel, etc.

  • Q. Why camber is provided in shuttering?

    Camber is provided in the formwork for horizontal members to counteract the effect of deflection caused due to the weight of reinforcement and concrete placed over that.

  • Q. Why lubrication is required on shuttering surfaces?

    Shuttering boards/Planks should be properly oiled or greased with shuttering oil before the placement of reinforcement. The oil film sandwiched between concrete and formwork surface not only helps in easy removal of shuttering but also prevents loss of moisture from the concrete through absorption and evaporation.

  • Q. When formwork should be removed?

    The removal of formwork after the concrete has set is termed as stripping. The period up to which the forms must be left in place before they are stripped is called stripping time. The factors affecting the stripping time are the position of the forms, the loads coming on the elements immediately after stripping, temperature of the atmosphere, the subsequent loads coming on the element etc. As a guideline, with temperature above 20 degree following time limits should be followed:

    Elements and Supporting conditions Stripping Time in Days
    Walls, columns, vertical sides of beam 1 to 2
    Slabs removal of props  
    a) Span up to 4.5m 7
    b) Span over 4.5 m 14
    Beam and arches: removal of props  
    a) Span up to 6m 14
    b) Span over 6m 21
  • Q. What precaution should be taken in GI (galvanized iron) concealed pipe line?

    It should be pressure tested.

  • Q. What class of GI pipe is generally used for residential construction?

    Class 'B' (medium grade) pipe.

  • Q. How to fix glazed tiles on walls?

    It should be fixed on rough plastered surface with cement mortar 1:1. Neat cement for fixing tiles should not be used.

  • Q. Can drainage from kitchen/toilet be directly connected to manhole?

    No. first, it should be connected to gully trap and then to the manhole.

  • Q. What is formwork?

    Forms or moulds or shutters are the receptacles in which concrete is placed, so that it will have the desired shape or outline when hardened. Once the concrete develops adequate strength, the forms are removed. Forms are generally made of the materials like timber, plywood, steel, etc.

  • Q. Why camber is provided in shuttering?

    Camber is provided in the formwork for horizontal members to counteract the effect of deflection caused due to the weight of reinforcement and concrete placed over that.

  • Q. Why lubrication is required on shuttering surfaces?

    Shuttering boards/Planks should be properly oiled or greased with shuttering oil before the placement of reinforcement. The oil film sandwiched between concrete and formwork surface not only helps in easy removal of shuttering but also prevents loss of moisture from the concrete through absorption and evaporation.

  • Q. When formwork should be removed?

    The removal of formwork after the concrete has set is termed as stripping. The period up to which the forms must be left in place before they are stripped is called stripping time. The factors affecting the stripping time are the position of the forms, the loads coming on the elements immediately after stripping, temperature of the atmosphere, the subsequent loads coming on the element etc. As a guideline, with temperature above 20 degree following time limits should be followed:

    Elements and Supporting conditions Stripping Time in Days
    Walls, columns, vertical sides of beam 1 to 2
    Slabs removal of props  
    a) Span up to 4.5m 7
    b) Span over 4.5 m 14
    Beam and arches: removal of props  
    a) Span up to 6m 14
    b) Span over 6m 21
  • Q. What precaution should be taken in GI (galvanized iron) concealed pipe line?

    It should be pressure tested.

  • Q. What class of GI pipe is generally used for residential construction?

    Class 'B' (medium grade) pipe.

  • Q. How to fix glazed tiles on walls?

    It should be fixed on rough plastered surface with cement mortar 1:1. Neat cement for fixing tiles should not be used.

  • Q. Can drainage from kitchen/toilet be directly connected to manhole?

    No. first, it should be connected to gully trap and then to the manhole.